One person's response - the addition of Y makes a substantial positive difference* to the effects of EC, and I add high ECGC content Green Tea extract as well, the science supports this addition, but I can't say I "feel" it, like I do the Y.
* - Oral Y, at doses below 0.2mg per Kg bodyweight, may not have that much positive benefit in increasing fat loss, but the Dopa/NE stimulation from lesser doses feels to me like it does, and there's a direutic effect at work here also.